portal_vfsops.c revision 132902
1/* 2 * Copyright (c) 1992, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software donated to Berkeley by 6 * Jan-Simon Pendry. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)portal_vfsops.c 8.11 (Berkeley) 5/14/95 33 * 34 * $FreeBSD: head/sys/fs/portalfs/portal_vfsops.c 132902 2004-07-30 22:08:52Z phk $ 35 */ 36 37/* 38 * Portal Filesystem 39 */ 40 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/domain.h> 44#include <sys/filedesc.h> 45#include <sys/kernel.h> 46#include <sys/lock.h> 47#include <sys/mutex.h> 48#include <sys/malloc.h> 49#include <sys/file.h> /* Must come after sys/malloc.h */ 50#include <sys/mount.h> 51#include <sys/proc.h> 52#include <sys/protosw.h> 53#include <sys/socket.h> 54#include <sys/socketvar.h> 55#include <sys/vnode.h> 56 57#include <fs/portalfs/portal.h> 58 59static MALLOC_DEFINE(M_PORTALFSMNT, "PORTAL mount", "PORTAL mount structure"); 60 61static vfs_omount_t portal_omount; 62static vfs_unmount_t portal_unmount; 63static vfs_root_t portal_root; 64static vfs_statfs_t portal_statfs; 65 66/* 67 * Mount the per-process file descriptors (/dev/fd) 68 */ 69static int 70portal_omount(mp, path, data, td) 71 struct mount *mp; 72 char *path; 73 caddr_t data; 74 struct thread *td; 75{ 76 struct file *fp; 77 struct portal_args args; 78 struct portalmount *fmp; 79 struct socket *so; 80 struct vnode *rvp; 81 struct portalnode *pn; 82 size_t size; 83 int error; 84 85 /* 86 * Update is a no-op 87 */ 88 if (mp->mnt_flag & MNT_UPDATE) 89 return (EOPNOTSUPP); 90 91 error = copyin(data, (caddr_t) &args, sizeof(struct portal_args)); 92 if (error) 93 return (error); 94 95 if ((error = fget(td, args.pa_socket, &fp)) != 0) 96 return (error); 97 if (fp->f_type != DTYPE_SOCKET) { 98 fdrop(fp, td); 99 return(ENOTSOCK); 100 } 101 so = fp->f_data; /* XXX race against userland */ 102 if (so->so_proto->pr_domain->dom_family != AF_UNIX) { 103 fdrop(fp, td); 104 return (ESOCKTNOSUPPORT); 105 } 106 107 MALLOC(pn, struct portalnode *, sizeof(struct portalnode), 108 M_TEMP, M_WAITOK); 109 110 MALLOC(fmp, struct portalmount *, sizeof(struct portalmount), 111 M_PORTALFSMNT, M_WAITOK); /* XXX */ 112 113 error = getnewvnode("portal", mp, portal_vnodeop_p, &rvp); /* XXX */ 114 if (error) { 115 FREE(fmp, M_PORTALFSMNT); 116 FREE(pn, M_TEMP); 117 fdrop(fp, td); 118 return (error); 119 } 120 121 rvp->v_data = pn; 122 rvp->v_type = VDIR; 123 rvp->v_vflag |= VV_ROOT; 124 VTOPORTAL(rvp)->pt_arg = 0; 125 VTOPORTAL(rvp)->pt_size = 0; 126 VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID; 127 fmp->pm_root = rvp; 128 fhold(fp); 129 fmp->pm_server = fp; 130 131 mp->mnt_flag |= MNT_LOCAL; 132 mp->mnt_data = (qaddr_t) fmp; 133 vfs_getnewfsid(mp); 134 135 (void)copyinstr(args.pa_config, 136 mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 137 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 138 139#ifdef notdef 140 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 141 bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal")); 142#endif 143 144 (void)portal_statfs(mp, &mp->mnt_stat, td); 145 fdrop(fp, td); 146 return (0); 147} 148 149static int 150portal_unmount(mp, mntflags, td) 151 struct mount *mp; 152 int mntflags; 153 struct thread *td; 154{ 155 int error, flags = 0; 156 157 158 if (mntflags & MNT_FORCE) 159 flags |= FORCECLOSE; 160 161 /* 162 * Clear out buffer cache. I don't think we 163 * ever get anything cached at this level at the 164 * moment, but who knows... 165 */ 166#ifdef notyet 167 mntflushbuf(mp, 0); 168 if (mntinvalbuf(mp, 1)) 169 return (EBUSY); 170#endif 171 /* There is 1 extra root vnode reference (pm_root). */ 172 error = vflush(mp, 1, flags, td); 173 if (error) 174 return (error); 175 176 /* 177 * Shutdown the socket. This will cause the select in the 178 * daemon to wake up, and then the accept will get ECONNABORTED 179 * which it interprets as a request to go and bury itself. 180 */ 181 soshutdown(VFSTOPORTAL(mp)->pm_server->f_data, 2); 182 /* 183 * Discard reference to underlying file. Must call closef because 184 * this may be the last reference. 185 */ 186 closef(VFSTOPORTAL(mp)->pm_server, (struct thread *) 0); 187 /* 188 * Finally, throw away the portalmount structure 189 */ 190 free(mp->mnt_data, M_PORTALFSMNT); /* XXX */ 191 mp->mnt_data = 0; 192 return (0); 193} 194 195static int 196portal_root(mp, vpp, td) 197 struct mount *mp; 198 struct vnode **vpp; 199 struct thread *td; 200{ 201 struct vnode *vp; 202 203 /* 204 * Return locked reference to root. 205 */ 206 vp = VFSTOPORTAL(mp)->pm_root; 207 VREF(vp); 208 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 209 *vpp = vp; 210 return (0); 211} 212 213static int 214portal_statfs(mp, sbp, td) 215 struct mount *mp; 216 struct statfs *sbp; 217 struct thread *td; 218{ 219 220 sbp->f_flags = 0; 221 sbp->f_bsize = DEV_BSIZE; 222 sbp->f_iosize = DEV_BSIZE; 223 sbp->f_blocks = 2; /* 1K to keep df happy */ 224 sbp->f_bfree = 0; 225 sbp->f_bavail = 0; 226 sbp->f_files = 1; /* Allow for "." */ 227 sbp->f_ffree = 0; /* See comments above */ 228 if (sbp != &mp->mnt_stat) { 229 sbp->f_type = mp->mnt_vfc->vfc_typenum; 230 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 231 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 232 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 233 } 234 return (0); 235} 236 237static struct vfsops portal_vfsops = { 238 .vfs_omount = portal_omount, 239 .vfs_root = portal_root, 240 .vfs_statfs = portal_statfs, 241 .vfs_unmount = portal_unmount, 242}; 243 244VFS_SET(portal_vfsops, portalfs, VFCF_SYNTHETIC); 245